Scraper for cleaning the riser of a petroleum pump



Nov. 27, 1962 G. BARTEL 3,065,795

SCRAPER FOR CLEANING THE RISER OF A PETROLEUM PUMP Filed Feb. 18. 1960 frlrerrzon' CihJr-mg 'Bfizrg 21/265, :2 ,w akw.

3,065,795 SQRAPER FOR CLEANING THE RISER OF A PETRGLEUM PUMP Gunter Bartel, Osnabruclr, Germany, assignor to Firma Lemforder Metallwarengesellschaft m.b.H., Lemforde, Haunover, Germany Filed Feb. 18, 1960, Ser. No. 9,596 Claims priority, application Germany Feb. 24, 1959 6 Claims. (Cl. 166-176) The present invention relates to a scraping device for cleaning by scraping the internal surface of a pipe such as is required for cleaning rising pipes in pumping wells used in the petroleum industry.

One form of scraper for cleaning the risers of petroleum pumps consists of two flexible plastic half shells enclosing the pump linkage rod which are held together and attached to the pump linkage rod by means of pipe clamps or the like.

It is an object of the present invention so to design the attachment and fastening of the plastic half shells as to ensure the absolutely firm location of the scraper on the pump rod linkage. Another object of the invention is substantially to simplify the attachment of the scraper on the pump linkage.

In order to solve this problem according to the present invention the upper and/or lower edges of the pipe clamps used for the attachment of the half shells are both provided with a ring of pointed teeth which on both sides of each clamp are inclined obliquely inwards towards the pump linkage rod and whose points-penetrating the material of the half shellsenter into the material of the pump linkage rod. Such teeth ensure the firm location of the scraper, because the teeth, which are preferably made of a material which is harder than that of the pump linkage rod, enter into the surface of the material of the rod when they are tightened and when a load is applied later in the course of the cleaning operation, thus preventing, due to the fact that the teeth are oblique, the dislocation of the scraper relative to the linkage. In time the teeth will enter a little deeper into the surface of the linkage, which will securely locate the scraper against dislocation in both directions of movement.

In a particularly advantageous embodiment of the invention it appears to be useful to design the pipe clamps as half clamps and to embed these into the plastic of the half shells in such a manner that only the means of attachment project from the half shells. The advantage of this is that each half clamp will form an integral unit with its half shell, which substantially simplifies assembly and storage of the components.

For the attachment and connection of the half shells it has been found useful, in addition to the usual fastenings, to provide the half shells with eyes projecting from the body of the shell which overlap with the corresponding eyes of the other shell so that the shells can easily be joined to one another by means of split pins passed through the eyes.

To facilitate assembly a special pair of pliers can be used by means of which the shells can be forced together as required until the split pins have been inserted into the overlapping eyes.

Several embodiments of the invention will now be described in detail by reference to the accompanying drawings, in which:

FIG. 1 is a side view partly in section showing a scraper asarss Patented Nov. 27, 1962 consisting of half-shells with the connection by clamps constructed in accordance with the invention, and

FIGS. 2 to 4 are cross sections showing several different fastenings in plan and omitting the scraper bars.

As shown in FIG. 1, the two half shells 1 and 2 are provided with scraper blades or edges 3 and 4 on their outsides. The part of the pump linkage rod to which the scraper blade is attached is denoted by 5. In applying the invention, the ends of the half shells 1 and 2 are provided with metal half clamps or sleeves 6 and 7 which are embedded into the half shells 1 and 2 and whose edges are provided on both sides with a ring of pointed teeth 8 integral therewith. When the clamps are tightened and when the parts move to and fro in the course of the cleaning operation, the teeth 8 enter into the surface of the material of the linkage rod 5. As seen in FIG. 1 the teeth are bent inwardly at an angle from the main part of the sleeve.

In the embodiment shown in FIGS. 1 and 3, the free ends of the half clamps form eyes 9 and 10 through which split pins 10a can be passed thus providing a secure connection of the half shells with one another. The half clamps 6, 7 are preferably provided at one end with a single eye 9 and at the other end with two eyes 10 whose distance from each other is equal to the length of the single eye, so that the single eye 9 will in each case be located between the two eyes 10 of the opposite clamp, the split pin 10a passing through them forming a secure connection of the halt clamps with one another.

In the embodlment shown in FIG. 2, the half clamps 6 and 7 are provided with lugs 11 and 12 connected by the screws 13. In this case the lug 12 is provided with a plain hole through which the screw 13 passes while the ing 11 is tapped so that the screw 13 can be screwed in firmly connecting the clamps with one another.

The only difference between the embodiment constructed in accordance with FIG. 4 and that of FIG. 3 is that in FIG. 4 the two lugs 11 and 12 are provided with plain holes, both parts being held together by a nut and bolt connection 14, 15.

What I claim is:

l. A scraper for cleaning the riser of a petroleum pump comprising two flexible plastic half shells surrounding the pump linkage rods, metal clamps in and around the half shells to hold the latter together and clamped to the pump linkage rod, the edges of the clamps being provided with a ring of pointed teeth which on both sides of each clamp are inwardly inclined towards the pump linkage rod, the points of the teeth penetrating the material of the half shells and projecting into the material of the pump linkage rod, and a scraper blade mounted on each half shell.

2. A scraper according to claim 1, in which fastening means are provided for each half shell so that a half clamp is joined to a half clamp of the opposite half shell by the fastening means.

3. A scraper according to claim 1, in which the free ends of each half clamp form projecting eyes which overlap axially with the eyes of the opposite clamp and pins inserted in the eyes for fastening the clamps together.

4. A scraper according to claim 1, in which the half clamps are provided at one end with a single eye and at the other end with two eyes whose distance apart is equal 3 to the length of the single cyfi and the single eye of one clamp is positioned between the two eyes of the opposite clamp.

5. A scraper according to claim 1, in which means of attachment are provided for the half clamps and the half clamps are embedded in the plastic of the half shells so that only the means of attachment project to the Outside with the half clamps and half shells forming one component member.

6. A scraper according to claim 1, in which the pointed teeth of the half clamps are made of spring steel which is harder than that of the pump linkage rod.

References Cited in the file of this patent UNITED STATES PATENTS Ingalls Nov. 23, 1943 Wright Feb. 21, 1956 Pigman et al. June 5, 1956 FOREIGN PATENTS Germany Mar. 27, 1958 

